A straight pipe if ok if you have a cab on a 1066. You are not going to tell a difference with a straight pipe on your engine temp, not enough to notice. Was your radiator boiled out at a radiator shop or did you flush it out your self? If it runs hot only under a heavy load it also could be a timing problem. Some machnics advances the timing up to 22 degrees and fuel up on the pump and that will cause higher engine temps but you will have a increase in power. A heavy duty radiator off a 1086 thru 1586 and changing the fan from a 6 blade fan to a 8 blade fan might help also. I did that on my 1466 a few years back and that did help a lot because it was turned up to about 180 hp an running pretty warm pulling a 20 ft disc in high 1st gear.
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